Improvement in carbonic-acid-gas generators



H. P'IETSCHQ.

Carbonic-Acid Gas Generators. P10455 04], Patented Sept.15,1874.

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UNITED STATES PATENT QFFIGE.

HERMANN PIETSOH, OF MILWAUKEE, WISOON SIN.

IMPROVEMENT IN CARBONlC-AClD-GAS GENERATORS.

Specification forming part of Letters Patent No. 155,041, datedSeptember 15, 1874; application filed July 10, 1874.

To all whom itmay concern Be it known that I, HERMANN PIETSCH, ofMilwaukee, in the county of Milwaukee, in the State of Wisconsin, haveinvented certain Improvements in Check and Safety Valves forOarbonic-Acid-Gas Generators, of which the following is a specification:

My invention has for its object the keeping the water from flowing fromthe washer into the generator, and for the safety of the generator by asafety-valve, and is accomplished by placing a check-valve in the pipewhich leads from the generator to the washer, so that when a vacuum, orpartial vacuum, is produced in the generator the water shall not flowover from the washer into the generator,

ings are sunk outside of the valve-seat, and then opening out throughthe valve-case E, a cover of some flexible material over the opening inthe valve-seat, and pillows to the sides of the valve-chamber, so thatwhen the valve is raised the gas may not reach and corrode the springwhich holds the valve down F, the valve; G, a spring round the valvestem, which, pressingagainst the valve and the cover of thevalve-chamber, holds the valve onto its seat, the stem of the valvepassing up through the cover; H, cover of the valve-chamber; I,check-valve seat and opening for the gas to pass through; K, the valve,

made of any material, and hung above the seat; L, the pipe, which passesfrom the generator to the washer; M, top of a carbonicacid-gasgenerator, showing the connection of the valve-case thereto only; N, topof-a washer, merely to show the connection of the pipe L thereto.

The operation of these valves is as follows: When the gas is generatedin the generator, it passes, through the valve-cover, into the washer,the check-valve opening freely to let it pass; but if there is a vacuumin the generator the valve is closed by the action of the gas in thewasher, and it cannot, nor can the water in the washer, pass back to thegenerator, and when there is too much pressure in the generator thesafety-valve will be opened, and the gas will escape.

I claim as my invention- Valve-case A, having the safety-valve B andcheck-valve I, substantially as specified.

HERMANN PIE'ISGH.

Witnesses:

J. B. SMITH, E. J. SMITH.

